One of London's most amazing attractions, this outstanding modern- and contemporary-art gallery is housed in the creatively revamped Bankside Power Station south of the Millennium Bridge. A spellbinding synthesis of modern art and capacious industrial brick design, Tate Modern has been extraordinarily successful in bringing challenging work to the masses, both through its free permanent collection and fee-paying big-name temporary exhibitions. The stunning Switch House extension opened in 2016, increasing the available exhibition space by 60%.